-18-(-f)=91

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Solution for -18-(-f)=91 equation:


Simplifying
-18 + -1(-1f) = 91

Remove parenthesis around (-1f)
-18 + -1 * -1f = 91

Multiply -1 * -1
-18 + 1f = 91

Solving
-18 + 1f = 91

Solving for variable 'f'.

Move all terms containing f to the left, all other terms to the right.

Add '18' to each side of the equation.
-18 + 18 + 1f = 91 + 18

Combine like terms: -18 + 18 = 0
0 + 1f = 91 + 18
1f = 91 + 18

Combine like terms: 91 + 18 = 109
1f = 109

Divide each side by '1'.
f = 109

Simplifying
f = 109

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